Service 903P duplicates the bulk of Bus Service 903‘s route, serving between Woodlands MRT / Bus Interchange and Marsling Lane. Operated using private buses from Rui Feng Chartered Pte Ltd, the route helps to relieve frequent overcrowding on Service 903. It does not serve Woodlands Train Checkpoint. It is the 12th PPSS service to be introduced, commencing operations on Tuesday, 13 January 2015.

Peak Period Short Services operate at least five trips per hour during Weekday AM and PM peak periods. This initiative taps on the resources of Private Bus Operators to run shorter bus services to augment the resources of the Public Transport Operators (PTOs).